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Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2020/2021 The development of new glass-ceramic tiles by sinter-crystallization method have been investigated using solid wastes (ceramic polishing, soda-lime-silicate glass, eggshell, mussel shell and industrial sludge’s). Chemical compositions of wastes and glass-ceramic samples were studied by X-ray fluorescence (XRF) and thermal analysis (TG/DSC). Structural characterization by X-ray diffraction (XRD) measurement revealed the crystalline phases depending on process parameters. The morphology of glass ceramic samples was characterized by scanning electron microscopy (SEM/EDX). The apparent density values were between 1,47 and 1,79 g/cm3 . Flexural strength values range between 52,09 and 97,76 N/mm2 . The experimental compositions allowed reutilizing residues to produce high mechanical resistance glass ceramic tiles with suitable properties and environmental profits.

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2019/2020 Pyrochlores are widely studied for their variety of properties according to their composition, hence their versatility. In this bibliographic work, the study of nanopigments with pyrochlore structure with luminescent properties is shown. It focuses on a wide range of theoretically based introductions of pigments, pyrochlore structure and luminescence. Specifically, Eu 3+ doped Gd2Ti2O7 is studied, comparing three methods of synthesis: sol-gel, Pechini and solid state. Finally, the experimental results are proposed through the application of X-Ray diffraction (XRD), Thermogravimetry/Differential Thermal Analysis (TG/DTA), Scanning Electron Microscopy (SEM) and Photoluminescence spectrocopy. Detailed description of each procedure step and discussion of the obtained results have been performed along the project. Additionally, a bibliographic search and description of main theoretical concept on pigments, together with analysis of State of art of inorganic pigments have been performed. Some possible application of the developed materials is proposed.

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2019/2020 Over the last years, an increasing concern has emerged regarding the eco-friendly management of plastic, glass and ceramic waste. Nowadays, the world economy remains heavily dependent on primary resources, which are becoming increasingly scarce on the basis of the current lineal economy model. For this reason, it is essential to evolve towards a circular economy and the recycling of waste. In recent years, composite materials have experienced a rapid growth in their development and use until becoming a commonly material in our daily live and replacing many conventionals materials such as metals, ceramic or polymers. This is due to the advantages that they can offer. The principal objective of fiber-reinforced composite is to acquire materials with high strength and high elastic modulus /stiffness. In this work, composite materials are formed by a ceramic matrix and a glass fiber or plastic fiber reinforcement. Several porcelain stoneware tile compositions are prepared using volume fraction between 5% and 75% of wt funcionalizate glass fibers. Then, the composition is examined. Previously, fibers were functionalizate by a mullite synthesis. The optimal treatment for mullite phase formation and higher mechanical resistance for ceramic material are obtained. Structural characterization of funcionalizate glass fibers and recycled plastics are studied with Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) by using X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM) and Differential Thermal Analysis/Thermogravimetric (ATD/TG).

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2018/2019 Transparent conductive oxides (TCO) are doped metal oxides used in optoelectronic devices such as flat panel displays and photovoltaics. In the present work, zinc oxides are doped with different metals (aluminium, silver, lithium, indium and gallium).These compounds have been synthesized by co-precipitation method starting from different precursors. The obtained powders have been deposited by spin coating technique and further heated in a muffle. During the preparation process, the influence of several parameters has been evaluated, e.g. the number of layers while doing the deposition process or heating cycle. The obtained coatings have been studied by applying X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM), UV-visible and IR spectroscopy. Detailed description of each procedure step and discussion of the obtained results have been performed along with the project.

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2018/2019 iber composite materials have great applications for the building and construction industries. The main objective of fiber-reinforced composites is to obtain materials with high strength together with a higher elastic modulus. In this work, composite materials of fibers were built as reinforcing agents in slip as a ceramic matrix. Fiber volume fractions between 5% and 20% were examined. For the preparation of several compositions of porcelain stoneware tiles, the fibers were first conditioned for later mixing with the slip. It has been evaluated the effect provided by each of the agents mentioned above, within the matrix in improving the mechanical properties of fiber-reinforced material. The resulting materials were studied by scanning electron microscope (SEM), flexural strenght mesuraments, particle size evaluation and colorimetry analysis.

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2017/2018 Mullite has achieved outstanding importance as a material for both traditional and advanced ceramics because of its favourable thermal and mechanical properties. Mullite displays various Al to Si ratios referring to the solid solution Al4+2xSi2−2xO10−x, with x ranging between about 0.2 and 0.9 (about 55 to 90 mol% Al2O3) [1]. In this work, the functionalization of the recycled glass fibers (obtained from the glycolysis process) with mullite crystals and its introduction into the precursor composition of the ceramic substrate was proposed. Mullite were first prepared by sol-gel method using colloidal silica and AlCl3·6H2O in water system. The gel mullite precursor was fired in the range 1000-1300ºC soaking times 30–300 min. The resultant materials were studied by X-Ray diffraction (XRD) and scanning electron microscope (SEM-EDX). On the other hand, the glass fibers were functionalizing through the previous mullite synthesized. Several porcelain stoneware tile compositions were prepared using high alumina clay, low alumina clay, kaolin, Turkish feldspar (Na), feldspar (Na/Mg), feldespathic sand and glass fiber functionalize. The resultant materials were studied by X-Ray diffraction (XRD), scanning electron microscope (SEM-EDX) and compressive test. High mechanical resistance ceramic material (> 450 Kg/cm2) was obtained

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2016/2017

Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2016/2017.